13
D.h.w. ˜ow switch, ÿlter and ˜ow
limiter
1
Function
The d.h.w. ˜ow switch
A
in Fig. 1 isa devicethat gener-
ates an electrical signal when hot water is drawn.
A
Fig. 1
When the ˜ow rate through the d.h.w. circuit reaches
about .6 gal/min’, thefloat 6 (Fig. 3) is drawn to-
wards the right.
The resulting magnetic ÿeld of ring 5 increases and re-
aches the ˜ow switch sensor 1.
The sensor generatesan electrical signal that switches
the boiler d.h.w operation ON.
The state of the sensor isalso indicated by meansof the
lamp
B
placed on the sensor body.
B
C
Fig. 2
2
Nomenclature and location of parts
(Fig. 3)
1
Flow switch sensor
2
Body
3
O---ring
4
Spring
5
Magnetic ring
6
Float
7
Threaded ring
8
Flow limiter (optional accessory)
9
Filter
10
Spring seat
5
6
4
9
2
8
7
3
1
Fig. 3
3
Checks
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
n
Flow switch sensor operation
1
Remove the front panel of the case.
2
Switch on the boiler and open a d.h.w. tap. The
lamp
B
(Fig. 2) placed on the sensor body is
switched on when the ˜ow rate reachesabout .6
gal/min’.
4
Removal of the f
low switch sensor
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1
Remove the front panel of the case.
2
Disconnect the connector
C
(Fig. 2) and remove
the sensor by delicately lifting up.
DHW Flow Switch and Filter
(edition-0106)
Third Part
RIVA FP SERVICE MANUAL - REV A
10-1
